无法播放mp4视频
问题描述：
我想在android中制作视频播放器。 它播放3GP格式的视频。 但它不支持mp4 video.Below是我在android中的代码相同。为什么它不支持设备和模拟器上的mp4格式？无法播放mp4视频
package com.example.videoplayer;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import org.json.JSONObject;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.webkit.URLUtil;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;
import android.widget.VideoView;
public class VideoViewDemo extends Activity {
private static final String TAG = "VideoViewDemo";
private VideoView mVideoView;
private EditText mPath;
private ImageButton mPlay;
private ImageButton mPause;
private ImageButton mReset;
private ImageButton mStop;
private String current;
@SuppressLint({ "NewApi", "NewApi", "NewApi" })
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.activity_main);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
mVideoView = (VideoView) findViewById(R.id.surface_view);
mPath = (EditText) findViewById(R.id.path);
mPath.setText("ooklnet.com/files/368/368007/video.mp4");
mPlay = (ImageButton) findViewById(R.id.play);
mPause = (ImageButton) findViewById(R.id.pause);
mReset = (ImageButton) findViewById(R.id.reset);
mStop = (ImageButton) findViewById(R.id.stop);
mPlay.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
playVideo();
}
});
mPause.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
if (mVideoView != null) {
mVideoView.pause();
}
}
});
mReset.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
if (mVideoView != null) {
mVideoView.seekTo(0);
}
}
});
mStop.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
if (mVideoView != null) {
current = null;
mVideoView.stopPlayback();
}
}
});
/*runOnUiThread(new Runnable(){
public void run() {
sleep(2000);
playVideo();
}
});*/
Thread _trd1 = new Thread() {
public void run() {
try {
sleep(2000);
runOnUiThread(new Runnable() {
public void run() {
playVideo();
}
});
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
_trd1.start();
// new DoBackgroundTask().execute();
}
public class DoBackgroundTask extends AsyncTask
<String, Void, String> {
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
}
protected String doInBackground(String... locationNames) {
playVideo();
return null;
}
protected void onPostExecute(String addresses){
}
}
private void playVideo() {
try {
final String path = mPath.getText().toString();
Log.v(TAG, "path: " + path);
if (path == null || path.length() == 0) {
Toast.makeText(VideoViewDemo.this, "File URL/path is empty",
Toast.LENGTH_LONG).show();
} else {
// If the path has not changed, just start the media player
if (path.equals(current) && mVideoView != null) {
mVideoView.start();
mVideoView.requestFocus();
return;
}
current = path;
mVideoView.setVideoPath(getDataSource("ooklnet.com/files/368/368007/video.mp4"));
mVideoView.start();
mVideoView.requestFocus();
}
} catch (Exception e) {
Log.e(TAG, "error: " + e.getMessage(), e);
if (mVideoView != null) {
mVideoView.stopPlayback();
}
}
}
private String getDataSource(String path) throws IOException {
if (!URLUtil.isNetworkUrl(path)) {
return path;
} else {
URL url = new URL(path);
URLConnection cn = url.openConnection();
cn.connect();
InputStream stream = cn.getInputStream();
if (stream == null)
throw new RuntimeException("stream is null");
File temp = File.createTempFile("mediaplayertmp", "dat");
temp.deleteOnExit();
String tempPath = temp.getAbsolutePath();
FileOutputStream out = new FileOutputStream(temp);
byte buf[] = new byte[128];
do {
int numread = stream.read(buf);
if (numread <= 0)
break;
out.write(buf, 0, numread);
} while (true);
try {
stream.close();
} catch (IOException ex) {
Log.e(TAG, "error: " + ex.getMessage(), ex);
}
return tempPath;
}
}
}
Please advise as soon as possible.
Thanks.
答
尝试正确的视频网址有协议：http://www.ooklnet.com/files/368/368007/video.mp4
答
问题可能与视频编码。 Android Froyo和姜饼不支持“Baseline”H264以外的H264格式。因此，如果您的视频是H264编码，请确保其编码为“AVC基准”。在Windows/Linux中使用一些工具，如“媒体信息”，并检查您的视频编码。如果可能，将视频转换为基线。
另一种解决方法是跳过视频视图并使用视频播放意图并将播放重定向到应用程序。系统将提示用户选择播放器来处理播放。显然，如果视频视图不能播放文件，默认播放器也不能处理文件。你可以选择一些其他已安装的播放器，如Mx-Player，它可以完美地播放文件。 希望能解决你的问题。
我敢打赌LogCat说没有找到类似文件的东西。 – RvdK 2013-02-21 07:47:16